… I love fluent interfaces, and I love the builder pattern. Fluent assertion pattern is supported by testing libraries. If you're using tools that get flummoxed by setters that return values, Paulo's pattern … I’d like to stress that Fluent Interfaces are not just Method Chaining. Some good examples in the Java world are jOOQ or Apache Camel. Or in the front-end world, jQuery is a good example. Typically, we could use a minimal example: In the JDK you can find the Calendar#getInstance() method that is similar to the previous example, among others. Introduction. Fluent Interface Definition by Wikipedia. Fluent is a pattern for adding method cascading to languages that don't have it, and combining cascading with chaining. In software engineering, a fluent interface (as first coined by Eric Evans and Martin Fowler) is an implementation of an object-oriented API … It’s important to understand that we’re not really changing any logic or behavior. You can certainly put a Fluent Interface on top of a Director/Builder pattern to make it read more – well – fluently and to emphasize the domain concepts (vs. the technical process of building and delegating). With Java 8 and the ability to pass a functional interface we can take a crack at another approach to building a nested fluent API. The Builder pattern is extremely popular in Java applications. In this post, I’ll use a Java library I recently open sourced to talk about both. Bad, Java! Before Java 8, a nested fluent API was difficult to write as the following articles demonstrate (here, here, and here). But also the stream API of Java 8 follows this style. One of them is asserjJ that works very well with JUnit. Fluent interface is a pattern, which usually relies on method chaining. The result will be Fluent Page Objects or Fluent Page Object Pattern. Further – in case of test failure – it facilitates writing one detailed message. Firstly it follows fluent builder pattern and allows to apply one assertion at a time. So, the factory pattern is well suited in providing a fluent mechanism to build objects. That would probably be an Expression Builder then. It’s often repeated among experienced software professionals that code is read FAR more than it is written. This construction is used quite often in frameworks which provide a fluent API. In this post on learning Java (and OOP) as a functional programming person, I look at the builder pattern, what problem it solves, and why it may be that way. I also don't see the critique of builder, mutability/immutability is … posted on Fri, Jan 03 '20 under tag: code. Paulo Abrantes offers another way to make JavaBean setters fluent: define an inner builder class for each JavaBean. Builder Pattern, Fluent Programming. 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